Mindray BeneView T1, Operator'S Manual

Page: 160 / 286

15-8
15.4.11 Entering the Standby Mode
By default, the CO
2
module is in measure mode. To enter or exit the standby mode manually, select [ Operating Mode ] in
the [ CO2 Setup ] menu and then toggle between [ Standby ] and [ Measure ].
The standby mode of the CO
2
module relates to the standby mode of the monitor as follows:
If the monitor enters the standby mode, the CO2 module will also enter the standby mode.
If the monitor exits the standby mode, the CO2 module will also exit the standby mode.
If the CO2 module enters or exits the standby mode, it will not affect the monitor.
When you set the sidestream CO
2
module to the strandby mode, the CO
2
gas sample intake pump automatically sets the
sample flow rate to zero. When exiting the standby mode, the CO
2
module continues to work at the preset sample flow
rate
For the sidestream CO
2
module, you can set the delay time. After the delay time the CO
2
module enters the standby
mode if no breath is detected.
For the microstream CO
2
module, you can also set a period of time after which the CO
2
module enters the standby mode
if no breath is detected since the CO
2
module is powered on or the CO
2
module switches to the measuring mode or the
automatic standby time is re-set. To set the standby time, in the [ CO2 Setup ] menu, select [ Auto Standby ] and then
select the appropriate setting.
15.5 Measurement Limitations
The following factors may influence the accuracy of measurement:
Leaks or internal venting of sampled gas
Mechanical shock
Cyclic pressure up to 10 kPa (100 cmH2O)
Other sources of interference, if any
Measurement accuracy of the sidestream CO
2
module may be affected by the breath rate and I/E ratio as follow:
etCO
2
is within specification for breath rate ≤ 60 bpm and I/E ratio ≤ 1:1;
etCO
2
is within specification for breath rate ≤ 30 bpm and I/E ratio ≤ 2:1.
Measurement accuracy of the microstream CO
2
module may be affected by the breath rate as follows:
EtCO
2
value is within specification for breath rate ≤ 80 rpm.
EtCO
2
accuracy is 4 mmHg or ±12% of the reading, whichever is greater, for breath rate > 80 rpm and EtCO
2
> 18
mmHg.
15.6 Leakage test
When the modules need maintenance, the monitor will prompt on the CO
2
waveform window: [ Need maintenance.
Enter CO2 setup menu. ] Then, select [ User Maintenance >> ]
→
[ Module Maintenance >> ]
→
[ Maintain CO2 >> ], and
perform leakage test according to the prompt messages on the menu.